Texas law enforcement officials
While there were
An unnamed official told the Los Angeles Times that Johnson "had no known criminal history or ties to terror groups."
Here's what else we kno
He has a military service record.
CNN's Ram Ramgo
Photos on Facebook appear to show Johnson in his military uniform.
A Facebook page belonging to Delphene Johnson, found by Mic, found photographs of
Johnson told tactical officers he was upset by Black Lives M
The movement focuses on institutional injustice and police violence against African-Americans sprung up amid grassroots activism in 2013, and has become an influentia
Prominent voices in the movement have condemned Thursday night's deadly shootings and violence against police generally.
Johnson told officers that he was upset about police shootings in Louisiana and Minnesota.
Just before the Dallas shooting, community members had been protesting in response to the police-involved deaths of black men this week. Alton Sterling, who was shot and killed outside a convenience store in Baton Rouge, Louisiana, and Philando Castile, who was shot and killed during a traffic stop in Falcon Heights, Minnesota, were the subjects of protests seen in large cities nationwide Thursday night.
Gut-wrenching video of those incidents have been circulated by news media and through social networks.
Johnson did not link himself to any particular political group.
But there was a political motivation to Thursday night's carnage, according to Dallas police chief David Brown. Johnson expressed anger toward white people and said he wanted to kill white police officers.
Johnson was reclusive, said a neighbor.
Wayne Bynoe told CNN that Johnson, who lived with his mother in the Dallas suburb of Mesquite, "keeps to himself."
Johnson's home was heavily armed
Dallas police say they found bomb-making materials, ballistics vests, rifles, ammunition and a journal full of combat tactics during a search of the residence, according to the Associated Press.
July 8, 2016, 5:40 p.m.: This story has been updated.